R7000 and ChromeCast: not connecting to 2.4 network

I don’t seem to be the only one with R7000+Chromecast issues, but trying all the tips I can Find here, I still can’t Get it to Work.

Firmware VersionV1.0.9.88_10.2.88

I connect to the Chromecast 2 (NC2-6A5) from an iPad on the 2.4 GHz network. The Google home app connect to the network, but the chromecast dosen’t.

I have tried to turn off the 5 GHz band, I have tried to turn on and off UPnP, I have ensured that there is no access control, and there is no guest network. The chromecast is located 3ft from the R7000.